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J Cell Biol. 2005 May 9;169(3):527-38.

Tight junctions in Schwann cells of peripheral myelinated axons: a lesson from claudin-19-deficient mice.

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1
Department of Cell Biology, Graduate School of Medicine, Kyoto University, Japan.

Abstract

Tight junction (TJ)-like structures have been reported in Schwann cells, but their molecular composition and physiological function remain elusive. We found that claudin-19, a novel member of the claudin family (TJ adhesion molecules in epithelia), constituted these structures. Claudin-19-deficient mice were generated, and they exhibited behavioral abnormalities that could be attributed to peripheral nervous system deficits. Electrophysiological analyses showed that the claudin-19 deficiency affected the nerve conduction of peripheral myelinated fibers. Interestingly, the overall morphology of Schwann cells lacking claudin-19 expression appeared to be normal not only in the internodal region but also at the node of Ranvier, except that TJs completely disappeared, at least from the outer/inner mesaxons. These findings have indicated that, similar to epithelial cells, Schwann cells also bear claudin-based TJs, and they have also suggested that these TJs are not involved in the polarized morphogenesis but are involved in the electrophysiological "sealing" function of Schwann cells.

PMID:
15883201
PMCID:
PMC2171943
DOI:
10.1083/jcb.200501154
[Indexed for MEDLINE]
Free PMC Article
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